Akasha's envenomed dagger allows her to delight in the drawn out suffering of her victims.

Hurls a poisoned dagger which deals large initial damage, and then deals damage over time. The poisoned unit has its movement speed slowed for 15 seconds. An instance of damage is dealt every 3 seconds.

Akasha is one of the many souls claimed by the blade, Frostmourne. Raised to serve the Lich King as a Banshee, she desired to become pure substance once more. Driving deep into the forests, she was able to subdue and possess a Succubus minion. Rightly bearing the title, Queen of Pain, she enjoys nothing more than inflicting massive damage on her foes, using both the poisonous strikes of her succubus host and the vicious howls retained from her Banshee nature. Akasha breaks her enemies' eardrums with torturing screams, some so loud they manifest into powerful waves that ripple across the lands, shattering all in their wake.

DOTA 2:

The Ecclesiast-King of Elze nursed a desire for pain--forbidden pain. In a less prominent political figure, such desires might be considered unwise, but in a monarch of his stature, to satisfy such thirsts would have threatened the virtue of the Divine Throne itself. Therefore he turned to his dungeon full of demonologists, promising freedom to whoever could summon a personal succubus of torment and bind it entirely to his service. The creature who arrived, Akasha by name, visited upon him such exquisite torments that he named her his Secret Queen, and he began to spend all his spare moments submitting to her clever torments--eventually abdicating all his responsibilities in his pursuit of the painful pleasures that only she could bring. Queen of Pain could bring him to the brink of death, but she was rune-bound to keep him alive. At last the King's neglect of state brought on an uprising. He was dragged from his chamber and hurled from the Tower of Invocations, and at the moment of death, Queen of Pain was let loose into the world, freed from servitude--freed to visit her sufferings on anyone she deigned to notice.